MBRP makes a dual out the back, Gibson exhaust makes a dual kit that exits behind each rear tire... I'm pretry sure both kits require the spare tire to be removed because there is not room to route the pipe on the drivers side because the spare tire is in the way.
I'm not sure if either of those kits are still in production. You can find videos on YouTube of the MBRP duals on a colorado
I would go to a muffler shop and see what they would charge to get what you want... might be close to the same price as buying a kit
2011 Colorado CC Z71 2LT 4X4 3.7L with a few mods
Last edited by GregDAP; 01-22-2017 at 11:07 PM.